Feed-water heater for water-tube boilers.



No. 633,699. Patented Sept. 26, I899. J. MlYABARA.

FEED WATER HEATER FOR WATER TUBE BOI LERS.

(Application filed July 27, 1899.)

(No Model.) 3 Sheets-Sheet l.

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No. 633,699. Patented Sept. 26, I899. J. MIYABARA.

FEED WATER HEATER FOR WATER TUBE BOILERS.

(Application filed July 27, 1899.)

3 Sheets$heet 2,

(No Model.)

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J. MIYABARA.

FEED WATER HEATER FOR WATER TUBE BOILERS.

lApplication filed July 27, 1899.1

(No Model.) 3 Sheets-Sheet 3,

NTE'D STATES PATENT OFFICE.

JIRO MIYABARA, OF TOKIO, JAPAN.

FEED-WATER HEATER FOR WATER-TUBE BOILE RS.

SPECIFICATION forming part of Letters Patent No. 633,699, datedSeptember 26, 1899.

Application filed July 27, 1899. Serial No.725,24l. (N0 model.)

To (all whom it Hwy OOH/6877b.

3e it known that I, JIRO MIYABARA, a sub 'oct of the Emperor of Japan,and a resident of Tokio, in the Empire of Japan, have invented a new anduseful Improvement in FeedlVater Heaters for ater-Tube Boilers, of whichthe following is a specification.

This invention has for its object to provide a simple, convenient, andefficient water-tube boiler in which there shall be an effectivecirculation of water and steam, and has more particularly for its objectto provide a structure in which the water which is fed to the boiler maybe circulated back and forth between the top drums or steam-chambers ofthe boiler, so as to become heated to a material degree by the escapinggases before it is permitted to escape into the said drums.

My present invention is more particularly directed to an improvement inthe structure set forth in my British Patent No. 9,131, dated April 80,1806, for improvement in water-tube boilers; and it consists inprovidingafeed-waterinlet-pipe which enters one of the compartments in ahollow casing in one of the top drums or steam-chambers, a plurality ofse ries of feed-water tubes leading back and forth between thecompartments in the said hollow casing and compartments in a-similarhollow casing in the other top drum or steamchamber, and a feed-wateroutlet-pipe leading from one of the compartments in the lastnamed hollowcasing to the interior of the steam-chamber within which the said hollowcasing is located.

A practical embodiment of my invention is represented in theaccompanying drawings, in which- Figure 1 is asectional side elevationof my improved boiler. Fig. 2 is a front elevation, partially insection, of the same; and Fig. 3 is a sectional plan view showing thearrangement of the feedavater tubes and their adjacent parts.

The water-tube boiler to which I have applied my improved structurecomprises two water-walls arranged to form the front and back of acombustion-chamber, each composed of horizontal cylindrical vesselsarranged one above another and connected together by interposedjunction-boxes or short vertical tubes, the upper drums of the twoseries being denoted by A A, which drums serve as steam-chambers. Thetwo walls thus constructed are connected by sets of diagonal or inclinedheating-tubes that extend across the combustion-chamber above thefire-grate, there being provided within the water vessels, except thetop and bottom ones, diaphragms o1-deflectors,wl1ich are so arranged asto direct the streams of water and steam arriving from the upper ends ofone of the lower groups of tubes into the lower ends of the next uppergroup of tubes, thereby permitting the remaining portions of thewater-tubes to act as downtakes.

Flanged hollow casings B B are secured along the interiors of the hollowdrums A A, which casings may be made of cast or wrought steel or othersuitable metal and so constructed that they may be taken off in order toclean, examine, or replace the fecd-waterheating tubes. The said hollowcasings are divided into a plurality of compartments by transversepartitions I) b.

A plurality of groups of feed-water-heating tubes 0 cross between thetwo uppermost cylindrical drums or steam-chambers, which tubes open intothe several compartments in the hollow casings B B, so as to form acirculation back and forth, as indicated by the arrows in Fig. 3 of thedrawings.

Sets of tubes D are located at each extreme side of the boiler, whichtubes cross between the front and back steam-chambers A A and serve toconvey the steam from the back steam-chamber A to the front chamber A.

A feed-water inlet-pipe E leads from some suitable source of supply (notshown) into the interior of the end compartment of the hollow casing Bat one side of the boiler, and a feed-water outlet-pipe F leads from theend compartment of the hollow casing B at the other side' of the boiler,which outlet-pipe extends downwardly to a point near the bottom of thesteam-chamber A and thence along the same for a considerable distance.This portion of the outlet-pipe F, which extends along near the bottomof the hollow drum orsteamcasing A, is preferably perforated, so as todistribute the water along the said chamber. By the structurehereinabove set forth the water being fed to the boiler is caused tocirculate back and forth across the combustionchamber, so that the wateris heated before it is permitted to be discharged into the back steamdrum or casing.

It is evident that slight changes might be resorted to in the form andarrangement of the several parts without departing from the spirit andscope of my invention. Hence I do not wish to limit myself strictly tothe structure herein set forth; but

What I claim is 1. In a water-tube boiler the combination with the frontand back top drums or steamchambers thereof, of hollow casings locatedwithin the said top drums, feed-water-heating tubes crossing between thetwo drums and communicating with the hollow casings, a feed-waterinlet-pipe arranged to enter one of the said hollow casings and afeed-water outlet-pipe arranged to lead from the other hollow casing,the said feed-water outlet-pipe having open communication with theinterior of the drum within which it is located, substantially as setforth.

2. In a water-tube boiler, the combination with the front and rear topdrums thereof, of feed-water-heating tubes crossing between the twodrums, hollow casings located within the said top drums, the saidcasings being provided with partitions so as to form junction-pocketsfor the said feed-water tubes, a

feed-water inlet-pipe leading to the end eompartment in one of thehollow casings and a feed-Water outlet-pipe leading from the endcompartment of the other hollow casing, the said water-outlet pipehaving open communication with the hollow drum within which it islocated substantially as set forth.

3. In a water-tube boiler the combination with the two top drums thereofand tubes connecting the drums at the extreme sides of the boiler, offeed-water-heating tubes crossing between the two drums intermediate thefirst-mentioned side tubes, hollow casings located within the top drumsfor receiving the ends of the feed-water-heating tubes, a feedwaterinlet-pipe leading to one of the hollow casings and a feed-wateroutlet-pipe leading from the other of the hollow casings and in opencommunication with the interior of the drum within which it is located,substantially as set forth.

In testimony that I claim-the foregoing as my invention I have signed myname, in presence of two witnesses, this 6th day of July, 1899.

JIRO MIYABARA.

Witnesses:

JOHN McLEAN, K. GoYonE.

